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using System;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Jellyfin.Extensions;
using MediaBrowser.Controller.Drawing;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Drawing;
using MediaBrowser.Model.Entities;
using Microsoft.Extensions.Logging;
using TagLib;
using TagLib.IFD;
using TagLib.IFD.Entries;
using TagLib.IFD.Tags;
namespace Emby.Photos;
/// <summary>
/// Metadata provider for photos.
/// </summary>
public class PhotoProvider : ICustomMetadataProvider<Photo>, IForcedProvider, IHasItemChangeMonitor
{
private readonly ILogger<PhotoProvider> _logger;
private readonly IImageProcessor _imageProcessor;
// Other extensions might cause taglib to hang
private readonly string[] _includeExtensions = [".jpg", ".jpeg", ".png", ".tiff", ".cr2", ".webp", ".avif"];
/// <summary>
/// Initializes a new instance of the <see cref="PhotoProvider" /> class.
/// </summary>
/// <param name="logger">The logger.</param>
/// <param name="imageProcessor">The image processor.</param>
public PhotoProvider(ILogger<PhotoProvider> logger, IImageProcessor imageProcessor)
{
_logger = logger;
_imageProcessor = imageProcessor;
}
/// <inheritdoc />
public string Name => "Embedded Information";
/// <inheritdoc />
public bool HasChanged(BaseItem item, IDirectoryService directoryService)
{
if (item.IsFileProtocol)
{
var file = directoryService.GetFile(item.Path);
return file is not null && item.HasChanged(file.LastWriteTimeUtc);
}
return false;
}
/// <inheritdoc />
public Task<ItemUpdateType> FetchAsync(Photo item, MetadataRefreshOptions options, CancellationToken cancellationToken)
{
item.SetImagePath(ImageType.Primary, item.Path);
// Examples: https://github.com/mono/taglib-sharp/blob/a5f6949a53d09ce63ee7495580d6802921a21f14/tests/fixtures/TagLib.Tests.Images/NullOrientationTest.cs
if (_includeExtensions.Contains(Path.GetExtension(item.Path.AsSpan()), StringComparison.OrdinalIgnoreCase))
{
try
{
using var file = TagLib.File.Create(item.Path);
if (file.GetTag(TagTypes.TiffIFD) is IFDTag tag)
{
var structure = tag.Structure;
if (structure?.GetEntry(0, (ushort)IFDEntryTag.ExifIFD) is SubIFDEntry exif)
{
var exifStructure = exif.Structure;
if (exifStructure is not null)
{
if (exifStructure.GetEntry(0, (ushort)ExifEntryTag.ApertureValue) is RationalIFDEntry apertureEntry)
{
item.Aperture = (double)apertureEntry.Value.Numerator / apertureEntry.Value.Denominator;
}
if (exifStructure.GetEntry(0, (ushort)ExifEntryTag.ShutterSpeedValue) is RationalIFDEntry shutterSpeedEntry)
{
item.ShutterSpeed = (double)shutterSpeedEntry.Value.Numerator / shutterSpeedEntry.Value.Denominator;
}
}
}
}
if (file is TagLib.Image.File image)
{
item.CameraMake = image.ImageTag.Make;
item.CameraModel = image.ImageTag.Model;
item.Width = image.Properties.PhotoWidth;
item.Height = image.Properties.PhotoHeight;
item.CommunityRating = image.ImageTag.Rating;
item.Overview = image.ImageTag.Comment;
if (!string.IsNullOrWhiteSpace(image.ImageTag.Title)
&& !item.LockedFields.Contains(MetadataField.Name))
{
item.Name = image.ImageTag.Title;
}
var dateTaken = image.ImageTag.DateTime;
if (dateTaken.HasValue)
{
item.DateCreated = dateTaken.Value.ToUniversalTime();
item.PremiereDate = dateTaken.Value;
item.ProductionYear = dateTaken.Value.Year;
}
item.Genres = image.ImageTag.Genres;
item.Tags = image.ImageTag.Keywords;
item.Software = image.ImageTag.Software;
if (image.ImageTag.Orientation == TagLib.Image.ImageOrientation.None)
{
item.Orientation = null;
}
else if (Enum.TryParse(image.ImageTag.Orientation.ToString(), true, out ImageOrientation orientation))
{
item.Orientation = orientation;
}
item.ExposureTime = image.ImageTag.ExposureTime;
item.FocalLength = image.ImageTag.FocalLength;
item.Latitude = image.ImageTag.Latitude;
item.Longitude = image.ImageTag.Longitude;
item.Altitude = image.ImageTag.Altitude;
if (image.ImageTag.ISOSpeedRatings.HasValue)
{
item.IsoSpeedRating = Convert.ToInt32(image.ImageTag.ISOSpeedRatings.Value);
}
else
{
item.IsoSpeedRating = null;
}
}
}
catch (Exception ex)
{
_logger.LogError(ex, "Image Provider - Error reading image tag for {0}", item.Path);
}
}
if (item.Width <= 0 || item.Height <= 0)
{
var img = item.GetImageInfo(ImageType.Primary, 0);
try
{
var size = _imageProcessor.GetImageDimensions(item, img);
if (size.Width > 0 && size.Height > 0)
{
item.Width = size.Width;
item.Height = size.Height;
}
}
catch (ArgumentException)
{
// format not supported
}
}
const ItemUpdateType Result = ItemUpdateType.ImageUpdate | ItemUpdateType.MetadataImport;
return Task.FromResult(Result);
}
}
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